Editorial Technical Reference

Hydraulic Systems

This page explains how Hydraulic Systems is classified within Machinery and Equipment Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

Power transmission systems that use pressurized hydraulic fluid to generate, control, and transmit mechanical force.

Product Specifications

Technical details and manufacturing context for Hydraulic Systems

Definition
Hydraulic systems are mechanical power transmission systems that utilize incompressible hydraulic fluid under pressure to generate, control, and transmit force. These systems convert mechanical energy into hydraulic energy through pumps, then transmit this energy through valves and actuators to perform work such as lifting, pressing, or moving heavy loads with precision and high force multiplication. The core components include a pump, reservoir, control valves, actuators (cylinders or motors), filters, and pressure relief valves. The pump, typically driven by an electric motor or internal combustion engine, draws fluid from the reservoir and pressurizes it. Control valves direct the flow to actuators, which convert hydraulic energy back into mechanical motion. Pressure relief valves protect the system from overpressure, while filters maintain fluid cleanliness. Hydraulic systems are widely used in industrial machinery, construction equipment, and manufacturing processes due to their high power density, precise control, and ability to handle heavy loads. They operate based on Pascal's principle, where pressure applied to a confined fluid is transmitted equally in all directions. The system's performance is characterized by parameters such as operating pressure, flow rate, reservoir capacity, power rating, operating temperature range, fluid viscosity grade, filtration rating, noise level, ingress protection, system weight, control voltage, and seal material. These parameters are specified as reference ranges and must be confirmed for the specific model and application. Standards such as ISO 4413, ISO 3448, ISO 4406, ISO 3744, IEC 60529, IEC 61131-2, and ISO 3601 provide guidelines for design, testing, and safety. Always verify model-specific values and standards with the legal manufacturer or supplier before procurement or installation.
Working Principle
Hydraulic systems operate based on Pascal's principle, which states that pressure applied to a confined fluid is transmitted equally in all directions. A hydraulic pump creates flow by converting mechanical energy into hydraulic energy, generating pressure in the fluid. This pressurized fluid is directed through control valves to hydraulic actuators (cylinders or motors), where the hydraulic energy is converted back into mechanical energy to perform work. The system maintains pressure through reservoirs, filters, and pressure relief valves to ensure efficient and safe operation.
Common Materials
Steel, Aluminum, Cast Iron, Rubber, Polymer Seals
Technical Parameters
ParameterTypical rangeNotes & selection driver
Flow RateRequired10–200 L/minVolume of hydraulic fluid delivered by the pump per unit timeISO 4413
Reservoir CapacityRequired50–500 LVolume of hydraulic fluid storage tankISO 4413
Power RatingRequired5–150 kWMaximum power input required by the hydraulic pumpISO 4413
Operating Temperature RangeRequired-20–+80 °CAllowable temperature range for hydraulic fluid during operationISO 4413
Fluid Viscosity GradeISO VG 32–68 mm²/sAffects pump efficiency and wearISO 3448
Filtration Rating10–25 μmCritical for component lifeISO 4406
Noise Level60–75 dB(A)Important for workplace safetyISO 3744
Ingress ProtectionIP54–IP65Higher IP for dusty or wet environmentsIEC 60529
System Weight100–2000 kgAffects installation and structural support
Control Voltage24 V DC ±10% VStandard for PLC and solenoid valvesIEC 61131-2
Seal MaterialNBR, FKM, PTFECompatibility with hydraulic fluid and temperatureISO 3601

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM
  • Hydraulic Pump
    Converts mechanical energy into hydraulic energy by creating flow and pressure in the hydraulic fluid
    Material: Cast iron or aluminum housing with steel gears/vanes/pistons
  • Hydraulic Cylinder
    Converts hydraulic energy back into linear mechanical force and motion
    Material: Steel barrel with chrome-plated piston rod and seals
  • Control Valves
    Directs and regulates the flow of hydraulic fluid to control speed, direction, and force
    Material: Steel or brass body with precision-machined spools and seals
  • Hydraulic Reservoir
    Stores hydraulic fluid, allows for heat dissipation, and separates air from the fluid
    Material: Steel or aluminum tank with breather and level indicators
  • Hydraulic Filter
    Removes contaminants from hydraulic fluid to protect system components
    Material: Steel housing with replaceable filter element
  • Pressure Relief Valve
    Protects the system from overpressure by diverting excess fluid back to the reservoir
    Material: Steel body with spring-loaded poppet and seals
  • Accumulator
    Stores hydraulic energy, dampens pressure surges, and provides emergency power
    Material: Steel shell with rubber bladder or piston and gas chamber
  • Hydraulic Fluid
    The pressurised medium that transmits the power from pump to actuator.
  • Hydraulic Motors Optional
    Convert hydraulic energy into rotary mechanical output.

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Hydraulic Systems.

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Up to 700 bar (10,000 psi) for standard systems, high-pressure variants up to 1000 bar
flow rate: 0.1 to 1000 L/min depending on pump size and system design
temperature: -40°C to 120°C (typical), with specialized fluids up to 200°C
contamination tolerance: ISO 4406 cleanliness codes 18/16/13 to 20/18/15 depending on component sensitivity
Media Compatibility
✓ Mineral-based hydraulic oils (ISO VG 32-68) ✓ Water-glycol fire-resistant fluids ✓ Synthetic ester-based fluids
Unsuitable: Chlorinated solvents or highly acidic environments (causes seal degradation and corrosion)
Sizing Data Required
  • Required force/torque output (kN or Nm)
  • Operating cycle frequency and duty cycle (%)
  • Available power source characteristics (kW, voltage, phase)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Cavitation
Cause: Low fluid pressure at pump inlet causing vapor bubble formation and implosion, damaging metal surfaces
Abrasive Wear
Cause: Contaminant particles (dirt, metal debris) in hydraulic fluid causing scoring and erosion of components
Maintenance Indicators
  • Unusual whining or knocking noises from pumps/motors
  • Visible fluid leaks or foaming in reservoir
Engineering Tips
  • Implement strict fluid cleanliness standards (ISO 4406) with regular filtration and contamination monitoring
  • Maintain proper fluid temperature and pressure ranges to prevent thermal degradation and cavitation

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
ISO 4413: Hydraulic fluid power - General rules and safety requirements for systems and their components ANSI/B93.5M: Hydraulic fluid power - Cylinders - Bore and rod area series DIN 24342: Hydraulic fluid power - Cylinders - Nominal pressures

Quoted from the published standard.

Manufacturing Precision
  • Cylinder bore diameter: +/-0.02mm
  • Sealing surface flatness: 0.1mm per 100mm diameter
Quality Inspection
  • Pressure testing: Hydrostatic test at 1.5x maximum working pressure
  • Material verification: Spectrographic analysis for alloy composition

Manufacturers of Hydraulic Systems

12 companies list this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

Jiangsu Guorui Hydraulic Machinery Co., Ltd.
Jiangsu, CN
Founded 1986340 plus staff120,000㎡
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “Cooling Solutions for Hydraulic Systems”
View source page ↗ grhcn.net · checked 2026-08-22
Fucheng LHD
Shanghai, CN
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “Jinan Fucheng Hydraulic Equipment Co., Ltd”
View source page ↗ fuchenglhd.com · checked 2026-08-26
GS
Hefei, Anhui, CN
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “Hydraulic Systems”
View source page ↗ gs-equip.com · checked 2026-09-16
Hebei Sinopulse Tech Group Co.,Ltd.
Handan, Hebei, CN
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “Hydraulic Systems”
View source page ↗ sinopulse.cn · checked 2026-09-08
Impro Precision Industries
Hong Kong, CN
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “Hydraulic Equipment”
View source page ↗ improprecision.com · checked 2026-08-27
Jiangsu Canete Machinery Manufacturing Co., Ltd.
Jiangsu, CN
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “Hydraulic Equipments”
View source page ↗ kiethydraulic.com · checked 2026-09-10
Junda Intelligent Equipment
Chongqing, CN
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “Hydraulic Equipment”
View source page ↗ jundaelectroplating.com · checked 2026-08-27
KIET
Taizhou, Zhejiang, CN
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “Hydraulic Equipments”
View source page ↗ chinakiet.com · checked 2026-09-05
LaserMicroFab
Shenzhen, Guangdong, CN
Also makes: Aerospace Components, Nozzle Plate, SMT Stencil and 6 more
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “Hydraulic Systems”
View source page ↗ lasermicrofab.com · checked 2026-09-14
Nanjing Metalli Industrial Co., Ltd.
Nanjing, Jiangsu, CN
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “Hydraulic Systems”
View source page ↗ metalli-china.com · checked 2026-09-09
Ningbo NJ Hydraulic Adapter Co., Ltd
Ningbo, Zhejiang, CN
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “Hydraulic equipment”
View source page ↗ njhydraulics.com · checked 2026-09-15
Ningbo Suijin Machinery Technology Co., Ltd.
Ningbo, Zhejiang, CN
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “Hydraulic Equipment”
View source page ↗ nbsjcast.com · checked 2026-09-13
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Frequently Asked Questions

What fluid viscosity grades are commonly used?

The directory lists ISO VG 32–68 as the fluid viscosity grade range, per ISO 3448. This affects pump efficiency and wear. The correct grade depends on operating temperature and manufacturer recommendations.

What is the significance of filtration rating?

Filtration rating, typically 10–25 μm per ISO 4406, is critical for component life. Proper filtration prevents contamination from damaging pumps, valves, and actuators. Confirm the required rating for your application.

What control voltage is standard for hydraulic systems?

The directory lists 24 V DC ±10% as the control voltage, per IEC 61131-2. This is common for PLC and solenoid valves. Verify compatibility with your control system.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification
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